Getting noticed on LinkedIn seems less about posting constantly and more about giving people a clear reason to remember you. A useful comment, a specific point of view, or a profile that actually explains what you do can probably achieve more than generic networking posts. The same basic principle applies in completely different online spaces, even somewhere like the NastyHookups hookup chat room: people respond to conversations that feel genuine rather than copied or forced. Obviously the purpose is very different, but making a good first impression online still comes down to communicating like a real person.
